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Ramsar of northern Iran located on the littoral of the Caspian Sea is considered one of the radon prone areas of the world. The annual effective dose in the district of Talesh-Mahalleh is higher than the dose limits for radiation workers by at least 13 times. In the present study, the indoor radon concentration and radon annual effective dose of the lung were estimated using a Prassi portable radon gas survey meter in a ventilated model house containing top soil samples from different parts of Ramsar. The average wind speed was maintained at 3.0 ms -1 matching the average wind speed of the region. For the extremely hot samples, the annual effective dose of the lung was 111±10.20mSv y -1 when the windows closed. However, when the windows opened in the wind direction and in the opposite wind direction, the annual effective doses of the lung were 2.46±0.86 and 4.16±0.81mSvy -1 , respectively. Also, when the crossed windows opened in no wind condition, the radon annual effective dose of the lung was 5.43±0.86mSvy -1 . The results suggest by opening the windows a significant reduction of the radon annual effective dose in buildings of Ramsar can be achieved.

Influence of ventilation conditions on the radon annual effective dose of the lungsimulatedfor radon prone areas of Ramsar